US9033464B2 - Printing apparatus - Google Patents
Printing apparatus Download PDFInfo
- Publication number
- US9033464B2 US9033464B2 US14/322,209 US201414322209A US9033464B2 US 9033464 B2 US9033464 B2 US 9033464B2 US 201414322209 A US201414322209 A US 201414322209A US 9033464 B2 US9033464 B2 US 9033464B2
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- US
- United States
- Prior art keywords
- robot arm
- ink
- head array
- printing apparatus
- linear rail
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
- B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J11/00—Manipulators not otherwise provided for
- B25J11/0075—Manipulators for painting or coating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S901/00—Robots
- Y10S901/30—End effector
- Y10S901/41—Tool
- Y10S901/43—Spray painting or coating
Definitions
- the present invention relates to a printing apparatus, and more particularly, to a printing apparatus capable of printing a pattern and/or a character on a curved printed surface, such as a surface of the airframe of a large passenger aircraft, in a short time.
- Patent document 1 U.S. Pat. No. 8,123,350
- a printing apparatus has been proposed in which a head array in which a plurality of nozzles are arranged is held by a robot arm of a multi-articulated robot of the type having six-axes, and the head array is moved to a predetermined targeted position on the printed surface to eject ink from the nozzle or nozzles, thereby applying printing.
- the printing apparatus can apply printing on the curved surface by supplying position information of the curved surface to the robot arm.
- Patent Document 1 The specification of U.S. Pat. No. 8,123,350
- an object of the present invention is to provide a printing apparatus which is capable of achieving a printing of a pattern and/or a character in a very short time even when a targeted surface to be printed is, for example, a curved surface such as an airframe surface of a large passenger aircraft.
- the present invention provides a printing apparatus for printing a pattern and/or a character onto a predetermined target position of a curved printed surface, which includes:
- a head array in which there is arranged a plurality of inkjet nozzles configured to eject an ink toward a remote position under a high-pressure by supplying an ink tank filled with the ink with a pressurized air for generating the high-pressure;
- a linear rail configured to allow the head array to perform a linear reciprocation thereof
- a multi-articulated robot equipped with a robot arm configured to adequately move the linear rail to a predetermined position and to hold the linear rail at the predetermined position;
- a robot arm controller configured to control driving of the robot arm on the basis of position information
- a controller configured to provide the robot arm controller with the position information and to perform driving control of the predetermined inkjet nozzle of the head array in association with the position information.
- the printing apparatus described above is characterized by further including a configuration such that the linear rail is provided with two rails arranged to be orthogonal to one another.
- the linear rail can be configured to be a support member attached to the robot arm, and to be movably supported on two vertical linear rails arranged to be attached to right and left leading ends of a bifurcated support member so as to be parallel to one another.
- the printing apparatus of the present invention there is such an effect that it is possible to quickly and accurately perform a uniform printing, even if the targeted and printed surface is, for example, a curved surface such as an airframe surface of a large passenger aircraft.
- FIG. 1 is a general overall view of a printing-operation site which illustrates a state of printing a large passenger aircraft carried out by a printing apparatus according to the present invention.
- FIG. 2 is a perspective view illustrating the printing apparatus according to an embodiment of the present invention.
- FIG. 3 is a diagrammatic view illustrating a constitution of a robot arm controller and a controller.
- FIG. 4 is an explanatory perspective view illustrating a configuration of a head array.
- FIG. 5 is a diagrammatic view, in part cross-section, illustrating a configuration of inkjet nozzles and ink tanks.
- FIG. 6 is a schematic view illustrating and explaining a printing apparatus according to a second embodiment of the present invention.
- FIG. 7 is a schematic perspective view illustrating a printing apparatus according to a third embodiment of the present invention.
- FIG. 1 is a general perspective view which illustrates and explains an operating site where printing of a large passenger aircraft is performed by employing a printing apparatus according to the present invention
- FIG. 2 is a perspective view illustrating the printing apparatus according to the preferred embodiment of the present invention
- FIG. 3 is a diagrammatic view which illustrates a constitution of a robot arm controller and that of a controller.
- a printing apparatus 2 illustrated in FIG. 2 as an embodiment of the present invention is generally provided with a head array 3 in which there are arranged a plurality of inkjet nozzle groups in an inkjet nozzle group assembly 16 (see FIG. 4 ) configured to perform ejection of an ink toward a remote position when supply of pressurized air to a group of ink tanks 6 filled with an ink, respectively, is carried out, a linear rail 4 provided for permitting the head array 3 to make a linear reciprocation therealong, a multi-articulated robot 5 equipped with a robot arm 5 a that appropriately moves the linear rail 4 to a predetermined targeted position to thereby hold the linear rail 4 at the targeted position, a robot arm controller 7 provided for controlling drive of the robot arm 5 a on the basis of position information, as illustrated in FIG. 3 , and a controller 8 provided for supplying the position information to the robot arm controller 7 while performing drive control of predetermined inkjet nozzle or nozzles in a nozzle group assembly 16 of the head array 3 in association
- the multi-articulated robot 5 is a mechanical device that is equipped with the robot arm 5 a which allows a free movement like an arm of a human body by means of a plurality of joints, and is able to freely move a leading end of the robot arm 5 a so as to correctly bring the leading end to an objective position.
- the multi-articulated robot 5 for example, it is possible to employ a six-axis control type industrial robot equipped with six axes of control, namely, six joints.
- the six-axis type multi-articulated robot by teaching information about the operation in advance, it is possible to move the linear rail 4 very precisely and rapidly to a position where it faces a predetermined targeted position of a printed surface 1 , as will be described later in more detail.
- the multi-articulated robot 5 is not limited to one having six axes of control, and it is possible to employ the multi-articulated robot having an appropriate more or less number of axes of control, for example, five axes, seven axes, or the like. Furthermore, since the multi-articulated robot per se is well-known in the art, the detailed description thereof will be omitted here.
- the head array 3 is a suitable means or device that can perform printing on the printed surface 1 by carrying out ejection of the ink of a predetermined color from the nozzles, and as illustrated in FIG. 4 , the nozzle group assembly 16 , each group having a plurality of built-in nozzles, is provided so as to eject ink of each color of black, cyan, magenta, yellow, and white.
- the nozzle group assembly 16 has a black nozzle group 16 a in which a plurality of nozzles provided so as to eject black ink are arranged in a row, a cyan nozzle group 16 b in which a plurality of nozzles provided so as to eject cyan ink are arranged in a row, a cyan nozzle group 16 c in which a plurality of nozzles provided so as to eject magenta ink are arranged in a row, a yellow nozzle group 16 d in which a plurality of nozzles provided so as to eject yellow ink are arranged in a row, and a white nozzle group 16 e in which a plurality of nozzles provided so as to eject white ink are arranged in a row.
- each group of the nozzle group assembly 16 mounted in the head array 3 is in fluid communication with the ink tank group assembly 6 having tanks that are filled with respective color inks of black, cyan, magenta, yellow, and white by way of a tube assembly 18 .
- an ink tank black 6 a filled with black ink is in fluid communication with the black nozzle group 16 a byway of a tube element 18 a
- an ink tank cyan 6 b filled with cyan ink is in fluid communication with the cyan nozzle group 16 b by way of a tube 18 b
- an ink tank magenta 6 c filled with magenta ink is in fluid communication with the magenta nozzle group 16 c by way of a tube 18 c
- an ink tank yellow 6 d filled with yellow ink is in fluid communication with the yellow nozzle group 16 d by way of a tube 18 d
- an ink tank white 6 e filled with white ink is in fluid communication with the white nozzle group 16 e by way of a tube 18 e .
- the pressurized air from a suitable air compressor 19 is adjusted to a predetermined pressure level by an air regulator 20 and is adapted to be supplied to each of the ink tank group assembly 6 by way of a pipe 21 .
- the afore-mentioned robot arm controller 7 includes an electronic circuit that can control the operation of the robot arm 5 a on the basis of the preliminarily taught position information that has been provided in advance. Moreover, the position information is adapted to be delivered to the robot arm controller 7 from the controller 8 .
- the controller 8 as shown in FIG. 3 is provided with a robot positioning processing unit 9 that can process data of the positioning information of the robot arm 5 a , a nozzle drive unit 10 that can operate each of the nozzle group assembly 16 provided in the head array 3 , a linear rail drive unit 11 that can position the head array 3 at a predetermined targeted position, and an image processing unit 12 that can process data of an image of print content to be printed on the printed surface 1 .
- the controller 8 is connected to a so-called conventional type personal computer (PC) 13 , and a non-illustrated storage device of the PC 13 is provided therein with a printed surface database unit (printed surface DB) 14 that can record and store data of information of a printed surface 1 such as a curved surface data (3D shape data) of an external surface 1 of an airframe of a large passenger aircraft as the printed surface 1 , and an image database (image DB) 15 that can record and store the image data for specifying the print contents to be printed on the printed surface 1 . That is, the necessary information, such as the image data to be printed onto the printed surface 1 and a curved surface state of the printed surface 1 , is inputted to the PC 13 .
- a printed surface database unit printed surface database unit
- image DB image database
- the PC 13 is configured to perform an operation of association between the position information and the image data of the printed surface 1 , based on the curved surface data (3D shape data) of the input printed surface 1 and the image data for specifying the print contents, to thereby specify what sort of printing manner and which position on the printed surface 1 an image is to be printed at, based on the image data, and to deliver the data of information about the associated position information and image data to the controller 8 .
- the image processing unit 12 Based on the associated position information and the information about the image data delivered to the controller 8 , the image processing unit 12 performs processing of the image of the print contents to be printed onto the printed surface 1 , the robot positioning processing unit 9 brings the robot arm 5 a to a predetermined targeted position via the robot arm controller 7 , the linear rail drive unit 11 positions the head array 3 at a predetermined position, and the nozzle drive unit 10 operates each of the nozzle group assembly 16 mounted in the head array 3 . Thus, the movement and positioning of the robot arm 5 a to a predetermined targeted position and the movement of the nozzle group assembly 16 in the head array 3 are performed in association with each other.
- the nozzle drive signal 17 is transmitted to the head array 3 from the nozzle drive unit 10 via a cable 17 a in FIG. 4 , meanwhile, the pressurized air is fed from the air compressor 19 equipped with the air regulator 20 through an ink tank pressure air pipe 21 in FIG. 5 , stable high-pressure air is applied to the ink tank group assembly 6 , the ink is supplied from the respective ink tanks 6 a to 6 e via the respective tube elements 18 a through 18 e , and the ejection of the ink of each color toward a predetermined targeted position of the printed surface 1 is performed in response to the nozzle drive signal 17 .
- a printing apparatus in which a head array is directly attached to the robot arm illustrated as a conventional example, it takes 50 ms to 150 ms to complete transmission of the position information to the robot arm from the robot arm controller. Furthermore, the time required for the robot arm to move to a predetermined targeted position requires 10 ms to 100 ms, even if it moves to a quite close position of the targeted position. Therefore, in order to eject the predetermined ink from the nozzles of the head array at a certain predetermined position and eject the next predetermined ink from the nozzles of the head array by moving the robot arm to a next predetermined position, the time of average 200 ms is required even if the drive time of the nozzles is not taken into account.
- the head array is directly held by the robot arm, for example, it might be possible to accurately move the head array from a point A to a point B separated from each other by 1 m.
- the trace of movement of the head array by the robot arm is often not constant but is frequently dispersed, and therefore, it is not possible to correctly grasp and manage the movement speed and the movement distance of the head array in the distance of 1 m. Therefore, it is not possible to strike a number of dots at correct positions and at a correct minute interval in the middle of the movement from point A to point B. Accordingly, in order to strike the dots at the correct position, the time of approximately 200 mS must be required for the exchange of the position signals and the movement of the robot arm, namely, the head array.
- the head array 3 is mounted on the linear rail 4 , and the robot arm 5 a holds the linear rail 4 .
- the linear rail 4 is arranged so as to be able to move the head array 3 on the straight line at high speed and to be able to precisely control the position of the head array 3 .
- approximately 2 sec is enough for the linear rail 4 to laterally move the head array 3 , namely, a predetermined nozzle at an accurately constant speed, and approximately 0.5 ms is enough to make striking of the next dot after ejecting one dot by the nozzle, including the transmission time of the nozzle drive signal 17 .
- the time is 2.4 hours in case of the printing apparatus according to the present invention, and it can be understood that it is possible to actually perform printing at speeds of 358 times compared to the printing apparatus of the related art.
- the number of nozzles held by the head array 3 is actually a plural number, the required printing time of 10 nozzles becomes one-tenth compared to that of the single nozzle, and this will be also the same with regard to the printing apparatus of the related art.
- the ink is to be ejected toward a front position of 100 mm distance
- a difference in distance between the nozzle group assembly 16 and the printed surface 1 is 100 mm or more between a higher position and a lower position of the curved surface, such as the airframe surface of the passenger aircraft, it is often unable to accurately strike the dots on the surface that is located at 100 mm or more distant away from the nozzle group assembly.
- a printing apparatus 2 according to the second embodiment illustrated in FIG. 6 is configured so that, on the linear rail 4 , an orthogonal linear rail 22 orthogonal thereto is additionally mounted, and the head array 3 is now held on the orthogonal linear rail 22 .
- it is possible to compensate for the blurring due to the flight distance of the dots by keeping a substantially constant distance between the printed surface 1 and the nozzle group assembly 16 by moving the head array 3 back and forth in the direction perpendicular to the lateral direction, while moving the orthogonal linear rail 22 holding the head array 3 in the lateral direction in FIG. 6 on the first linear rail 4 .
- the printing speed is somewhat lowered as compared to the printing apparatus in the first embodiment.
- the printing apparatus 2 according to the third embodiment illustrated in FIG. 7 is configured in such a manner that a fork-shaped support member 24 having a pair of bifurcated parts is provided in the robot arm 5 a , a vertical linear rail 23 a is attached to a leading end of a left part 24 a of the support member 24 and a vertical linear rail 23 b is attached to a leading end of a right part 24 b thereof so as to be parallel to each other, and both ends of the linear rail 4 holding thereon the head array 3 are mounted on the two vertical linear rails 23 a and 23 b , respectively so that the rail 4 is bridged over the vertical linear rails. Moreover, it is possible to move the head array 3 from a certain line to the next line by driving the vertical linear rails 23 a and 23 b.
- the average 200 ms is required to move the head array 3 to the next line as in the first embodiment, but since the head array can be moved at the average 50 ms, it is possible to make the printing speed faster.
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- Engineering & Computer Science (AREA)
- Robotics (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Coating Apparatus (AREA)
- Ink Jet (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
Abstract
Description
1,000 mm divided by 0.254 mm=3,937 dots
1,000 mm divided by 0.254 mm=3,937 dots
3,937 times 3,937=15,499,969 dots
3,937×3,937×200 ms=3,099,993 (sec)
3,099,993 sec divided by (60 times 60)=861.1 hours
2 s divided by 0.5 ms=4,000
3,937
3,937 times 0.2 (sec)=787.4 sec.
7,874 sec+787.4 sec=8661.4 sec
8661.4 divided by (60×60)=2.4 hours
3,937 times 0.05 sec=196.9 sec
787.4 sec minus 196.9 sec=590.5 sec
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- 1 printed surface
- 2 printing apparatus
- 3 head array
- 4 linear rail
- 5 multi-articulated robot
- 5 a robot arm
- 6 ink tank groups
- 7 robot arm controller
- 8 controller
- 9 robot positioning processing unit
- 10 nozzle drive unit
- 11 linear rail drive unit
- 12 image processing unit
- 13 PC
- 14 printed surface DB
- 15 image DB
- 16 nozzle group assembly
- 17 nozzle drive signal
- 18 tube element
- 19 air compressor
- 20 air regulator
- 21 ink tank pressurized air pipe
- 22 orthogonal linear rail
- 23 a, 23 b vertical linear rail
- 24 support member
- 24 a, 24 b bifurcated parts
Claims (3)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2013140545 | 2013-07-04 | ||
JP2013-140545 | 2013-07-04 | ||
JP2013-151336 | 2013-07-22 | ||
JP2013151336A JP6198499B2 (en) | 2013-07-04 | 2013-07-22 | Printing device |
Publications (2)
Publication Number | Publication Date |
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US20150009254A1 US20150009254A1 (en) | 2015-01-08 |
US9033464B2 true US9033464B2 (en) | 2015-05-19 |
Family
ID=51389860
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/322,209 Active US9033464B2 (en) | 2013-07-04 | 2014-07-02 | Printing apparatus |
Country Status (3)
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US (1) | US9033464B2 (en) |
EP (1) | EP2839964B1 (en) |
JP (1) | JP6198499B2 (en) |
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US7604848B2 (en) * | 2005-10-28 | 2009-10-20 | Seiko Epson Corporation | Method for forming a mark with pivoting of a nozzle about its target |
US8348384B2 (en) * | 2009-03-06 | 2013-01-08 | Ulvac, Inc. | Rotational adjustment apparatus for inkjet coating head |
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Also Published As
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EP2839964A1 (en) | 2015-02-25 |
EP2839964B1 (en) | 2017-05-24 |
JP2015027636A (en) | 2015-02-12 |
JP6198499B2 (en) | 2017-09-20 |
US20150009254A1 (en) | 2015-01-08 |
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